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Section 5: Maintenance & Lubrication
RC5615, RC6615, RCM5615, & RCM6615 Series 2 S/N Rotary Cutters 330-323M
5/6/20
47
Cutter Blade Assembly (RC66 Series Shown)
Figure 5-7
Direction of Blade Rotation
Figure 5-8
37617
Use 1-11/16"
Socket Wrench
On Blade Nut (#3)
Blade Bolt Kit & Dishpan Part No’s.
# Part No. Part Description
318-586A BLADE BOLT KIT (Item No’s 1, 2, & 3)
1 802-277C BLADE BOLT 1 1/8-12 x 3 7/16 WITH KEY
2 804-147C WASHER FLAT 1 HARD ASTMF436
3 803-170C NUT HEX TOP LOCK 1 1/8-12 PLATE
4 330-970H RC56 WELDMENT DISHPAN
4 318-190D RC66 DISHPAN
5 840-273C PLUG LP 3" ID RUBBER
6 820-168C CUTTER BLADE 1/2 x 4 x 29 CCW (center)
6 820-169C CUTTER BLADE 1/2 x 4 x 23 CCW (Wing)
6 820-170C CUTTER BLADE 1/2 x 4 x 23 CW (Wing)
Optional Low Lift Blades, Standard Rotation
*
6 820-478C CUTTER BLADE 1/2X4X29 LL CCW (Center)
6 820-479C CUTTER BLADE 1/2X4X23 LL CCW (Wing)
6 820-480C CUTTER BLADE 1/2X4X23 LL CW (Wing)
CCW
CCW
CW
5. Shut tractor down before dismounting. Refer to
6. Disconnect main driveline from the tractor’s power
take-off shaft.
Refer to Figure 5-7:
7. Remove rubber plug (#5) above cutter blade (#6).
Rotate blade bolt (#1) until in alignment with access
hole (A).
8. Unscrew locknut (#3) to remove cutter blade (#6).
Blade bolt (#1) is keyed and will not turn freely.
9. Both blades should be sharpened at the same angle
as the original cutting edge and must be replaced or
re-ground at the same time to maintain proper
balance in the cutting unit. The following precautions
should be taken when sharpening blades:
a. Do not remove more material than necessary.
b. Do not heat and pound out a cutting edge.
c. Do not grind blades to a razor edge. Leave a blunt
cutting edge approximately 1/16” thick.
d. Always grind cutting edge so end of blade remains
square to cutting edge and not rounded.
e. Do not sharpen back side of blade.
f. Both blades should weigh the same with not more
than 1 1/2 oz. difference. Unbalanced blades will
cause excessive vibration which can damage
gearbox bearings and create structural cracks.
Refer to Figure 5-8:
10. Carefully check cutting edges of blades in relation to
blade carrier rotation to ensure correct blade
placement. Cutter blades must be installed with
cutting edge leading in rotation
.
Refer to Figure 5-7:
WARNING
!
To avoid serious injury or death:
A locknut that has been removed can lose its thread locking
properties. Reusing a used locknut can result in a thrown
blade. Always use a new locknut when installing blades.
11. Insert blade bolt (#1) through blade (#6),
dishpan (#4), and flat washer (#2). Secure blade with
a
new locknut (#3)
and torque to 450 ft-lbs.
12. If replacing RC56 Series dishpan (#4) or RC66
Series blade bar (#10), nut (#7) on gearbox output
shaft should be torqued to 550 ft-lbs. minimum and
secured with cotter pin (#8) with both legs bent
opposite directions around the nut.
13. Replace rubber plug (#5).
14. Reconnect main driveline to tractor power take-off
shaft and remove support blocks.
IMPORTANT: